Yelp speak the languages they spoke in life and are prone to make a dog like yelp when injured or panicking and their stinger is located in their right wrist, hidden by a skin hood when not in use and protruding out, past the hand like a spike when in use.

An afflicted humanoid who dies from yelp fever rises as a yelp at the next noon. A humanoid who becomes a yelp in this way retains none of the abilities it possessed in life. It is not under the control of any other yelps, but it hungers for the flesh of the living and behaves like a normal yelp in all respects. A humanoid of 4 Hit Dice or more rises as a sigran, not a yelp.